WM 9X00IN Optical WAVEGUIDE - Most Bus (All Models): Repair
WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
The defective LWL must be replaced. The LWL will not be repaired.
When exchanging the LWL, the optical contacts from the plug connection must be removed.